WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in CLH — Clean Harbors Inc
CIK 1644956
CHICAGO, IL
Position in CLH
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$127,049,489
+$47,478,467 QoQ
Shares Held
443,098
+30.6% QoQ
Ownership
0.838%
of shares outstanding
% of Portfolio
0.42%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Jun 2025
4 quarters on record
Voting authority
Sole 98.55788110079486.ToString("F0")%
Shared 0.ToString("F0")%
None 1.442118899205142.ToString("F0")%
Common Shares in CLH Over Time
Shares Held
Position Value (USD)
Position in Waste Management
Industrials · as of Mar 31, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $226,787,168 across 2 Waste Management names. CLH ranks #1 (56.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | CLH |
Clean Harbors Inc
This page
|
443,098 | $127,049,489 | |
| 2 | CWST |
Casella Waste Systems Inc
|
1,257,092 | $99,737,679 |
All Filings in CLH
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4 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $127,049,489 | 443,098 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $79,571,022 | 339,351 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $89,255,614 | 384,358 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $95,114,849 | 411,432 | Shares | Sole | 2025-07-29 | |
| No filing history on record for this holder in this stock. | ||||||